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Carbon that has been locked away for thousands of years could escape into the atmosphere if global warming thaws large patches of frozen ground in Alaska and Siberia as expected...
Scientists calculate that about 500 gigatons (Gt) of carbon is locked away in yedoma permafrost. One gigaton is equal to one billion tons.
The summer range of Arctic sea ice is shrinking by about 70,000 square kilometres a year, a surface area roughly equivalent to Lake Superior, said David Barber of the University of Manitoba.
Dr. Barber, who has been studying the issue for 25 years, said that "for the first 15 years I was a skeptic. . . . I've moved to the position now to saying we are at the point of no return."
So, when will Arctic waters will be ice-free and open for commercial navigation? Dr. Barber said estimates range from 2010 to 2100.
Sea-ice retreat is real, but need not be a disaster, said George Newton.
Melting sea ice means potentially more economic activity in the Arctic in the form of seabed mining, oil and gas exploration and shortened transport routes between the Pacific and Atlantic Oceans.
Originally posted by Hellmutt
500 billion tons of Carbon? That sounds nice. Should we expect an accelerated global warming then? Global warming releasing lots of carbon trapped in ice, which in turn creates more global warming. I wonder what else might be lurking in the ice, waiting to be released...
Originally posted by Ptolomeo
The Earth is changing very quickly, many are not aware of it, other refuse to admit it... But what will happen is just a matter of time.
Originally posted by Darkmind
Why does the man refuse to recognise the existence of global warming? I just don't get it!